Systems and methods for mixed grant-free and grant-based uplink transmissions

Patent metadata

Field	Value
Publication number	US-10813124-B2
Application number	US-201816193365-A
Country	US
Kind code	B2
Filing date	Nov 16, 2018
Priority date	Dec 16, 2016
Publication date	Oct 20, 2020
Grant date	Oct 20, 2020

Abstract

There may be situations in which it is beneficial for a user equipment to switch between grant-free uplink wireless transmissions and grant-based uplink wireless transmissions. Systems and methods are disclosed that help facilitate grant-based and grant-free uplink wireless communications, and the switching between the two. For example, systems and methods for mitigating collision between a granted uplink wireless transmission and a grant-free uplink wireless transmission are disclosed herein.

First claim

The invention claimed is:

1. A method performed by a user equipment (UE), the method comprising:
receiving a grant-free (GF) cell radio network temporary ID (C RNTI);
when a resource configuration for type 1 GF transmission is received, retransmitting a first data packet according to a received first downlink control information (DCI) whose cyclic redundancy check (CRC) is scrambled with the GF C RNTI, wherein the first data packet has been initially transmitted based on the resource configuration for type 1 GF transmission; and
when a resource configuration for type 2 GF transmission is received, deactivating the resource configuration for type 2 GF transmission, based on a received second DCI whose CRC is scrambled with the GF C RNTI;
the method further comprising retransmitting a second data packet according to a third DCI whose CRC is scrambled with the GF C RNTI, wherein the second data packet has been initially transmitted based on the resource configuration for type 2 GF transmission.

2. The method of claim 1 , wherein when a radio resource control (RRC) signaling comprising a first set of parameters of the resource configuration for type 2 GF transmission is received: receiving a fourth DCI whose CRC is scrambled with the GF C RNTI, wherein the fourth DCI comprises a second set of parameters of the resource configuration for type 2 GF transmission.

3. The method of claim 1 , wherein the resource configuration for type 1 GF transmission is received by RRC signaling without DCI signaling, and the resource configuration for type 2 GF transmission is received by both RRC signaling and DCI signaling.

4. A user equipment (UE), comprising:
a receiver, configured to receive a grant-free (GF) cell radio network temporary ID (C RNTI);
a transmitter, configured to:
when a resource configuration for type 1 GF transmission is received, retransmit a first data packet according to a received first downlink control information (DCI) whose cyclic redundancy check (CRC) is scrambled with the GF C RNTI, wherein the first data packet has been initially transmitted based on the resource configuration for type 1 GF transmission; and

a resource detector, configured to:
when a resource configuration for type 2 GF transmission is received, deactivate the resource configuration for type 2 GF transmission, based on a received second DCI whose CRC is scrambled with the GF C RNTI;

wherein the transmitter is configured to retransmit a second data packet according to a third DCI whose CRC is scrambled with the GF C RNTI, wherein the second data packet has been initially transmitted based on the resource configuration for type 2 GF transmission.

5. The UE of claim 4 , wherein the receiver is configured to: when a radio resource control (RRC) signaling comprising a first set of parameters of the resource configuration for type 2 GF transmission is received, receive a fourth DCI whose CRC is scrambled with the GF C RNTI, wherein the fourth DCI comprises a second set of parameters of the resource configuration for type 2 GF transmission.

6. The UE of claim 4 , wherein the resource configuration for type 1 GF transmission is received by RRC signaling without DCI signaling, and the resource configuration for type 2 GF transmission is received by both RRC signaling and DCI signaling.

7. A method performed by a base station, the method comprising:
transmitting a grant-free (GF) cell radio network temporary ID (C RNTI) to a user equipment (UE);
when the base station configures the UE for type 1 GF transmission: transmitting a first downlink control information (DCI) whose cyclic redundancy check (CRC) is scrambled with the GF C RNTI; and receiving, according to the first DCI, a retransmission of a first data packet, wherein the first data packet was initially transmitted from the UE based on a resource configuration for the type 1 GF transmission;
when the base station configures the UE for type 2 GF transmission: transmitting a second DCI whose CRC is scrambled with the GF C RNTI, the second DCI indicating deactivation of a resource configuration for the type 2 GF transmission;
the method further comprising: transmitting a third DCI whose CRC is scrambled with the GF C RNTI; and receiving, according to the third DCI, a retransmission of a second data packet, wherein the second packet was initially transmitted from the UE based on the resource configuration for the type 2 GF transmission.

8. The method of claim 7 , the method further comprising: transmitting a radio resource control (RRC) signaling comprising a first set of parameters of the resource configuration for the type 2 GF transmission; and transmitting a fourth DCI whose CRC is scrambled with the GF C RNTI; wherein the fourth DCI comprises a second set of parameters of the resource configuration for type 2 GF transmission.

9. The method of claim 7 , wherein the resource configuration for type 1 GF transmission is transmitted by RRC signaling without DCI signaling, and the resource configuration for type 2 GF transmission is transmitted by both RRC signaling and DCI signaling.

10. A base station, comprising:
a transmitter, configured to:
transmit a grant-free (GF) cell radio network temporary ID (C RNTI) to a user equipment (UE);
when the base station configures the UE for type 1 GF transmission: transmit a first downlink control information (DCI) whose cyclic redundancy check (CRC) is scrambled with the GF C RNTI;

a receiver, configured to:
receive, according to the first DCI, a retransmission of a first data packet, wherein the first data packet was initially transmitted from the UE based on a resource configuration for the type 1 GF transmission;

the transmitter further configured to:
when the base station configures the UE for type 2 GF transmission: transmit a second DCI whose CRC is scrambled with the GF C RNTI, the second DCI indicating deactivation of a resource configuration for the type 2 GF transmission;

the transmitter further configured to transmit a third DCI whose CRC is scrambled with the GF C RNTI; and the receiver further configured to receive, according to the third DCI, a retransmission of a second data packet, wherein the second packet was initially transmitted from the UE based on the resource configuration for the type 2 GF transmission.

11. The base station of claim 10 , wherein the transmitter is further configured to: transmit a radio resource control (RRC) signaling comprising a first set of parameters of the resource configuration for the type 2 GF transmission; and transmit a fourth DCI whose CRC is scrambled with the GF C RNTI; wherein the fourth DCI comprises a second set of parameters of the resource configuration for type 2 GF transmission.

12. The base station of claim 10 , wherein the resource configuration for type 1 GF transmission is transmitted by RRC signaling without DCI signaling, and the resource configuration for type 2 GF transmission is transmitted by both RRC signaling and DCI signaling.

Assignees

• Cao Yu
• Zhang Liqing
• Ma Jianglei
• Huawei Tech Co Ltd

Inventors

• Cao Yu
• Zhang Liqing
• Ma Jianglei

Classifications

• H04W72/23 Primary

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/1268

  of uplink data flows · CPC title

• H04W72/1215 Primary

  for collaboration of different radio technologies · CPC title

• H04L1/1864

  ARQ related signaling (H04L1/1607 takes precedence) · CPC title

• H04L1/1877

  for semi-reliable protocols, e.g. for less sensitive applications like streaming video (buffer level management for video bitstream control arrangements H04N21/44004) · CPC title